Section 1 Overview

1.1 2023-03 Release

The 2023-03 Release is a major release that introduces new features and offers significant improvements to the existing sub-grid sampling functionality. A range of general new features, enhancements and bug fixes are also included. These include:

  • New GIS Vector file format – GeoPackage
  • New GIS Raster file formats – GeoTIFF and GeoPackage
  • Layered interflow (Sub-Surface) Flows
  • Sub-Grid Sampling (SGS) improvements
  • 2D bridge modelling enhancements
  • 2D weir flow enhancements

EPA SWMM Linking to TUFLOW: On request from USA XPSWMM users, TUFLOW linkage with 1D EPA SWMM has been added as supported functionality in the 2023-03-AD release. This new functionality provides users with an alternative to XPSWMM, within a GIS model build and result viewing environment. Importantly, the computational solution is comparable to using XPSWMM because TUFLOW Classic & HPC are the Classic and Extreme 2D solvers used by XPSWMM. TUFLOW-SWMM tutorials are available from the TUFLOW Wiki. Demonstration of the workflow and automation tools available to support the conversion of XPSWMM models to TUFLOW-SWMM is also provided in the TUFLOW Wiki.

A new Chapter in this document (Section 4) details this TUFLOW-SWMM functionality.

As always, it is recommended that when switching to a new build with an established model, test runs are carried out and comparisons made between the old and new builds (subtracting the two maximum water level (h) data sets and reviewing any differences is an easy way to do this). If you have any queries on the comparison, or require clarification or more detail on any of the points below, please email